A lek is when a bunch of male hummingbirds, as many as 100, will get together and sing for the females. If a female appears to be interested in a particular male then he will dance for her. If the female likes the dance preformed by the male then they will mate.
The act of mating only last about four seconds! Isn’t that amazing? After mating, the birds will each go their own way. It is the female hummingbird bares the sole responsibility for building the nests and caring for the young birds once they are born. After mating, the male has no further responsibilities toward reproduction. The male is then off to find a new female with which to mate once again.